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Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 10-12-2010, 02:01 AM   #1
paraklas
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Cleaning brake calipers from Rust and Brake Dust!

Continuing my 330 rear caliper mod to my 320, time has come to clean the 330 calipers. They had a very very nasty layer of rust and brake dust, bonded together, which took countless hours with dremel with sandpaper/stone/brush to clean them. Now I have some persistent dust/rust in areas I can't reach, i.e. between cylinder and caliper.

Is there any solution to remove the brake dust buildup completely? I was thinking soaking them in rust inhibitor for a day or two, what do you think ?
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Old 10-12-2010, 11:07 AM   #2
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Paraklas,

I usually use this to rebuild the Calipers and Paint them.

http://www.evapo-rust.com/

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Old 10-12-2010, 06:19 PM   #3
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Sandblast them. Watch out around the rubber at the piston though.

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Old 10-12-2010, 06:25 PM   #4
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Para, if the calipers are off the car, you can use compressed air to blow the piston out (push air through where the brake line goes)...if that's what you mean...and at that point, it makes sense to rebuild with the new seal and dust cover. Otherwise, not sure what area you can't get to. Sounds like they're clean enough...and I wouldn't risk the sandblasting as if the seal gets damaged, you'd get rust forming behind like I saw on my piston just last week...the rust on piston prevented it from retracting fully and thus getting new pads on.

Brake cleaner, brass brush...dial up the ocd meds...works for me everytime! (kidding...I am unmedicated, though I shouldn't be!)

HTH

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Old 10-13-2010, 08:11 AM   #5
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Thanks for the tips. I will order a caliper rebuilt kit tonight from the cheap usa as far as seals.

The previous owner must have tried to paint the calipers and used them while paint was still wet or something. The steel brush at 3000rpm would only polish the crust that was formed on them! Now they are clean apart from some stubborn areas which I want to clean before proceeding. I'll get some pictures up tonight to see thanks again
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Old 10-13-2010, 06:33 PM   #6
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Anthony, is that product safe on seals and rubber on calipers? Can u just soak the area liberally with that stuff and be ok?
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Old 10-14-2010, 12:09 AM   #7
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Anthony, is that product safe on seals and rubber on calipers? Can u just soak the area liberally with that stuff and be ok?
The Product will not harm rubber, plastic, clothing or glass either. I would take the Caliper apart to remove all debris...

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Old 10-14-2010, 12:24 AM   #8
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Pics of the almost clean calipers.






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Old 10-17-2010, 10:56 AM   #9
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After soaking for 2 days in rust inhibitor:




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Old 10-28-2010, 08:48 AM   #10
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ru gunna paint too? or just cleaning up?
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Old 10-28-2010, 10:16 AM   #11
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Painted with matte silver high-temp spray paint (up to 700 degrees Celsius)
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Old 10-28-2010, 10:51 AM   #12
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Old 10-28-2010, 01:48 PM   #13
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Old 10-28-2010, 02:02 PM   #14
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I would have removed the bleed screw and the piston and just painted the caliper. If it was black rubber to begin with I would have tried to keep it that way. The way you cleaned them up was outstanding from where they were though - good job.
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Old 10-28-2010, 02:55 PM   #15
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Thanks!

I rushed to paint them to prevent rusting again. I'm waiting for a caliper rebuilt kit to arrive, seals, bleed screw and piston!
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Old 10-28-2010, 11:36 PM   #16
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wow... i'm wanting to do this too... my brakes have turned to a nice **** brown after all the brake dust. whats the type of paint that you used exactly?
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Old 10-29-2010, 12:15 AM   #17
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What was the brand of rust inhibitor you soaked the calipers in - was it the Evapo-Rust?
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Old 10-29-2010, 12:48 AM   #18
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wow... i'm wanting to do this too... my brakes have turned to a nice **** brown after all the brake dust. whats the type of paint that you used exactly?
Motip Silver heat resistant spray paint
Product Here

I used the same paint to do the fronts and they are fine after a year!

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What was the brand of rust inhibitor you soaked the calipers in - was it the Evapo-Rust?
No, I could not find it. I used Hammerite Rust Remover. From the pic in the link below, the rightmost bottle.
Product link here
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Old 10-29-2010, 08:53 PM   #19
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well worth the effort!
pics of finished product please(for everyone!)
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Old 03-30-2012, 02:33 PM   #20
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Hey Paraklas, for the Motip Silver heat resistant spray paint, which size did you buy the 100 or 400 mL? I want to do all 4 calipers
Also, do you know why red color is only rated to 300 degrees instead of 800?
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